New behavior for checkout attempt against an open circulation:

New behavior for checkout attempt against an open circulation:

If existing circ is for a different patron, offer:

  Cancel
  Normal Checkin then Checkout
  (if Overdue) Forgiving Checkin then Checkout

If existing circ is for the same patron, offer:

  Cancel
  Normal Checkin then Checkout
  Renew

Unless circ.checkout_auto_renew_age is set and the circulation is older than that specified interval, in which case, automatically try a renewal instead of a checkout.

git-svn-id: svn://svn.open-ils.org/ILS/trunk@14082 dcc99617-32d9-48b4-a31d-7c20da2025e4